Vacuum-pump.



Gr. H. ZSOHEGH.

VACUUM PUMP.

APPLICATION 1 11 31) FEB. 10, 1908.

Patented Nov. 23, 1909.

QBHEETS-SHEET 1.

G.- H. ZSCHEGH.

VACUUM PUMP.

APPLICATION FILED FEB. 10/1908. 940,913;

Patented Nov. 23, 1909.

3 SHEETS-SHEET 2.

20 W1; Z 6 0 T 21 :2; l x o 7 a I O T G. H. ZSGHEGH.

- VACUUM PUMP.

I APPLICATION FILED FEB. 10, 1908. 940, 9 1 3 Patented Nov. 23, 1909.

3 SHEETS-SHEET 3.

v UNITED sT TEs'15 htrnivr OFFICE.

GUSTAVUS I-I. ZSCI-IECH, OF BERWYN, ILLINOIS; JOHN F. DEVINE, ADMINISTRATOR OF SAID GUSTAVUS H. ZSCI-IECI-I, DECEASED, ASSIGNOR TO STANDARD MACHINERY COMPANY, OF CHICAGO, ILLINQIS, A CORPORATION OF ILLINOIS.

VACUUM-PUMP.

To all whom it may concern: 1

Be it known that I, GUSTAVUS H. ZsoHEcH, a citizen of the United States of America, and a resident of Berwyn, Cook county, State of Illinois, have invented certain new and useful Improvements in Vacuum- Pumps, of which the following is a specification.

The main objects of this invention are to provide an improved form of vacuum pump particularly adapted for handling water or liquids containing impurities and solid'matter, the mechanism being arranged so as to reduce to the minimum the possibility of being rendered inoperative through wear, corrosion or clogging of the parts by the impurities and solid matteryto provide an improved form of steam admission valve for such pumps; to provide an improved structure and arrangement of the induction valves; and to provide an improved arrangement of the water injecting devices for condensing the steam in the pumping chambers. These objects are accomplished by the device shown in the drawings, in which- Figure 1 is an elevation, partly in section, of a vacuum pump constructed according to this invention. Fig. 2 is a horizontal sec tion on the line AA of Fig. 1, some of the parts within the delivery chamber and the left-hand pumping cylinder 1 -being broken away or omitted to illustrate the shape ofthe openings in the base. Fig. 8 is a detail, in elevation, of the delivery valves and their cage. Fig. 4c is a sectional detail illustrating the construction of the induction valve and the water inlet valve and sprayer, the section being taken on the line BB of Fig. 5.

Fig. 5 is a top plan of the induction valve and water spraying device. Fig. 6 is a horizontal section through the steam chest, the section being taken on the line D-D of Fig. 7. Fig. 7 is a vertical section of the same on the line 0-0 of Fig. 6.

In the structure shown in the drawings, the pump comprises a pair of pumping chambers 1 and a delivery chamber 2. The bases 3 of the pumping chambers are connected together by a fitting 4 to which the induction pipe is connected at 5, and said bases S'are connected to the base 60f the delivery chamber by separate pipes 7 all of said parts being preferably integral with each other and forming the base of the ap- Specification of Letters Patent.

paratus, said base being supported on three standards 8. Communication between the induction pipe and the individual pumping chambers is controlled by means of the induction valves 9. The condensing water is supplied by the pipe 10, which has a branch extending to each pumping chamber and communicating with the interior of the hollow standard 11. The branches of the pipe 10 are preferably connected directly into the threaded counter-bores 12 in the lower ends of the standards, so as to avoid making a packed joint between said branches and the base plate.

Each standard 11 is connected with the part 3 by means of two bolts 13 andis preferably of such form as to overhang the middle of the seat 1 1 of the induction valve. This seat has a spider 15 extending across it, and both said spider and the standard are provided with studs 16 which form seats for the opposite ends of a guide tube 17 upon which the valve 9 is slidable. The valve 9 preferably consists of a rubber disk clamped between heads formed of a metal which will not be readily corroded by the impurities in the water. With the construction shown, when the bolts 13 are removed,

the standard 11 may be lifted, permitting the valve 9 and its guide 17 to be readily removed.

The injection of water is controlled by a ball valve 18 whose movement is limited by a cage 19 having perforated walls which serve the purpose of breaking up the inflowing water into a large number of fine jets. The cap of the cage is secured to the standard by means of a single bolt, the removal of which permits ready access to the valve, as

will be understood from Fig. 4.

The discharge of the pumping cylinders is controlled by means of ball valves 20 which open upward into the discharge chamber 2 and which are confined to a limited movement above their seats by means of a cage 21.

The admission of steam to the pumping cylinder is controlled by a slide valve 22, Figs. land 7, which is slidably mounted'in a steam chest 23. The steam chest has a connection 24 with the source of .steam and is provided with ports 25 which control the admission of steam to the respective pumpmg chambers. There is a by-pass passage 26 connecting the two pumping chambers Patented Nov. 23, 1909'. Application filed February 10, 1908. Serial No. 415,226. I

above the valve 22, and the valve 22 is provided with a piston wing 27 which extends across the by-pass 26 and causes the valve v22 to be shifted through a difference in the E pressures in the two pumping cylinders.

The piston 27 consists of two interfitting' parts which are normally urged apart by one or more springs 28 so as to expand the The delivery chamber 2 connects with the discharge pipe at 30, Fig. 1, and is provided with an air chamber 31, as usual in devices of this class.

The construction and arrangement of the steam admission valve and chest are such that all surfaces which must be finished are plane surfaces which may be easily and accurately faced by means of ordinary machine tools. The valve chest consists of a hollow casting, the partitions 29 and 32 being integral therewith. The front and back of the chest are open throughout the length of the valve seat 33. The front and back openings are closed by plates 34 secured by bolts.

The operation of the device show-n is as follows :-When the steam admission valve is in the position shown in Fig. 1, the lefthand pumping chamber is in communication with the steam inlet pipe 24, and the steam pressure forces the contents of said pumping chamber outward through the corresponding passage 7 and past the valve 20 into the discharge chamber. As soon as the level of the contents of said pumping chamber has fallen below the sprayer 19, the water inlet valve 18 opens on account of the reduced pressure thereon and causes condensing water to be sprayed in all directions into said pumping chamber. This condenses the steam therein, causing a sudden fall of pres sure. On account of the partial vacuum thus formed in the left hand pumping chamber, the air pressure in the right-hand pumping chamber acts upon the piston .27 and causes the valve 22 to be shifted to the left-hand end of its seat, opening communication between the steam pipe 24; and the right-hand pumping chamber.

The vacuum formed by the condensation of the steam in the lefthand pumping chamber causes the induction valve 9 to open and permits a quantity of the material which is being pumped to flow into said pumping chamber. During this operation the steam entering the right-hand chamber 1 is discharging material therefrom. The operation continues in this manner automatically, successive operations occurring alternately in the two chambers so that the discharge from the outlet 30 of the discharge casing is practically continuous, the fluctuations in pressure being compensated by the entrained air in the air chamber 31.

The spaces between the metal disks and the rubber disk of the induction valves 9 are preferably packed full of loose asbestos so as to prevent moisture from accumulating therein with the possible effect of breaking the valve through freezing when the pump is not in use.

What I claim as my invention and desire to secure by Letters Patent is 1. In a vacuum pump, the combination of a pair of pumping chambers, a steam admission chest having a plane valve seat provided with two ports respectively communieating with said chambers, a valve slidable across said ports and adapted to reciprocate to alternately open said ports to their respective chambers, a by-pass in said chest at one side of said valve, and having opposite ends communicating with the respective pumping chambers and a piston carried by said valve and extending across said by-pass, whereby said valve will be shifted through the difference in pressure in the chambers.

2. In a vacuum pump, the combination of a pair of pumping chambers, a steam admission chest having therein a plane valve seat, admission ports in said seat for admitting steam to the respective chambers, a slide valve adapted to control said ports and slidable on said seat for alternately opening said ports to the respective chambers, a passage communicating with said chambers and extending through said chest on the opposite side of said valve from said seat, and an expandible piston carried by said valve and extending across said passage, said chest hving opposite removable side plates ex tending throughout the entire length of the travel of said valve and piston. 3. In a vacuum pump, the combination of a base, a valve seat thereon, a disk valve coacting with said seat and having a central aperture therethrough, a guide extending slidably through said aperture, and a standard removably mounted on said base at one side of said seat and rigidly supporting said guide, all being arranged to permit said valve to be readily removed through the removal of said standard from said base.

4. In a vacuum pump, the combination of a pumping chamber, a base therefor, an induction port in said base, a disk valve controlling said port and having a central aperture therethrough, a spider extending across said port and having an upwardly disposed stud, a standard removably mounted on said base near said seat and having thereon a stud located in alinement with the stud on said spider, and a tubular guide fitting the aperture in said valve and having its ends seated on said studs.

5. In a vacuum pump, the combination of a pumping chamber having a base, an incondensing Water inlet pipe being detachable duction port extending through said base from said base and adapted to permit the and having a valve seat at its upper end, a ready removal of said valve and guide disk valve co-acting With said seat and havthrough the removal of said pipe. 5 ing an aperture therethrough, a guide for l Signed at Chicago this 8th day of Feb- 15 said valve extending through said aperture, ruary, 1908.

a seat 011 said base for the lower end of said GUSTAVUS H. ZSCHECH. guide, a condensing-Water inlet pipe arched I Witnesses: over said valve seat and having thereon a E. A. RUMMLER,

10 seat fitting the upper end of said guide, said MARY M. DILLMAN. 

